v=spf1 ip4:107.20.210.250 ip4:52.1.14.157 ip4:107.23.16.222 ip4:54.173.83.138 ip4:12.34.56.78 include:us._netblocks.mimecast.com include:spf.protection.outlook.com include:spf.mtasv.net include:et._spf.pardot.com include:servers.mcsv.net include:mailgun.org ~all